Multitech GPRS Manual de usuario descargar pdf (Pagina 12)

Chapter 2 – Dialing Services

Multi-Tech Systems, Inc. AT Commands for Wireless Modems with IP Connectivity (S000333B) 12

#CONNECTIONSTART Start Communication

Definition: This command directs the TCP/IP stack to originate an outgoing call.

Upon receiving this command, the TCP/IP stack attempts to complete a connection session according

to the GPRSMODE parameter, selecting the GSM or GPRS mode.

In GSM mode, the TCP/IP stack will dial the number according to the Dial Option parameter (DIALN1 or

DIALN2 depending on DIALSELECT). If an error occurs, the TCP/IP stack automatically re-attempts the

call origination attempt, according to the REDIALCOUNT parameter. Once the physical layer is up, the

TCP/IP stack runs the applicable protocol as specified in the PPPMODE parameter.

In GPRS mode, the TCP/IP stack will establish a GPRS session with the APN using APNUN, APNPW,

GPRSCID parameters. Once the GPRS link is up, the product is connected to the Internet. The

AT#CONNECTIONSTOP command closes the GSM or GPRS connection by going on hook.

Values: Read Parameters for GSM Mode:

DIALN1

DIALN2

DIALSELECT

ISPPW

ISPUN

REDIALCOUNT

REDIALDELAY

If PPPMODE set to 2 or 4:

PPPMYIP

PPPPEERIP

PPPSERVPW

PPPSERVUN

For GPRS Mode:

APNPW

APNSERV

APNUN

GPRSCID

Syntax: AT#CONNECTIONSTART

Command (GSM Mode) Possible Responses

AT#CONNECTIONSTART

Note: Request connection to GSM

network

DIALING

Note: Phone line is available

2124560123

Note: Dial DIALN1 or DIALN2 number depending on

DIALSELECT

CONNECT 9600

Note: Modem speed negotiated between both sides. If the

TCP/IP stack is configured for modem only operation

(PPPMODE parameter), there are no more return codes

213.192.200.4

Note: IP address attributed to the TCP/IP stack

OK_Info_PPP

Note: As soon as the TCP/IP stack software displays this

message, it is ready to receive commands

AT#CONNECTIONSTART BUSY

Note: A busy signal is detected on the remote site

TCP/IP stack will wait REDIALDELAY seconds then dial again.

The redialing will continue until success or until the number of

call retries defined in parameter REDIALCOUNT has been

reached.

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